thanks, l will try it
在 2012-6-20 晚上8:59，"Danil ŢORIN" <torin...@gmail.com>写道：
>
> I think you are looking for FieldCache.
>
> I'm not sure the current status in 4x, but it worked in 2.9/3.x.
> Basically it's an array, so access is quite straight forward, and the
> best part IndexReader manage those for you, so on reopen only new
> segments are read.
>
> Small catch is that FiledCaches are per segment, so you need to be
> careful if you want to retrieve data using global document ids.
> However if you are building result set in your own Collector, using
> FieldCache is quite straight forward.
>
>
> On Wed, Jun 20, 2012 at 3:49 PM, Li Li <fancye...@gmail.com> wrote:
> > hi all
> > I need to return certain fields of all matched documents quickly.
> > I am now using Document.get(field), but the performance is not well
> > enough. Originally I use HashMap to store these fields. it's much
> > faster but I have to maintain two storage systems. Now I am
> > reconstructing this project. I want to store everything in lucene.
> > when I use an IndexSearcher to perform searching, I can get
> > related fields by docID. it must thread safe. And like the IndexReader
> > it's a snapshot of the index
> > Here are some solutions I can come up with:
> > 1. StringIndex
> > I have considered StringIndex but some fields need to tokenize.
> > maybe I can use two fields, one is tokenized for searching. Another is
> > indexed but not analyzed, the later one is only used for StringIndex.
> > If there is any better solution, maybe I have to use this one.
> > 2. Associating a Map with each IndexReader
> > when the IndexReader is opened or reopened, I need to iterate
> > through each documents of this Reader and put everything into a map.
> > The problem is it's slower and I don't know whether it's problematic
> > with NRT.
> >
> > is there any other better solution? thanks.
> >
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